Abstract
It is shown that a working process of rock excavation realized by an open-pit front-shovel excavator is characterized by an increased power intensity due to counteraction of its main actuating mechanisms (lifting and thrusting), whose operational parameters have to be properly matched during their joint action to provide more efficient excavation. A computational experiment allowed to determine an actual work of lifting and thrusting forces immediately involved in developing an excavated face. It was further established that power inputs depend on the bucket position relative to the working area of an excavator, and such regions of that area where those inputs are higher were determined. Differentiated calculation of the inputs was carried out, based on the type of a conducted operation – power inputs originating from excavating, from counteraction of the main mechanisms, and from lifting operational equipment parts and rock. The power intensity of excavation was estimated for various regions of the workspace of the excavator. The proposed method for calculating the power inputs of rock excavation using the operational equipment of an open-pit excavator would allow to determine an energy characteristic of the excavator for specific mining and technical conditions of operation.
Highlights
It is shown that a working process of rock excavation realized by an open-pit front-shovel excavator is characterized by an increased power intensity due to counteraction of its main actuating mechanisms, whose operational parameters have to be properly matched during their joint action to provide more efficient excavation
The proposed method for calculating the power inputs of rock excavation using the operational equipment of an open-pit excavator would allow to determine an energy characteristic of the excavator for specific mining and technical conditions of operation
The goal of the research and its tasks The research is aimed at increasing the power efficiency of open-pit excavators by properly matching operational parameters of their main mechanisms, which act in joint during the process of rock excavation
Summary
Designs of electromechanical crawler-mounted open-pit excavators (mechanical shovels) are technically quite unique but often show many signs of discrepancy between their technical level and low quality of the control system which is in charge of the working process of rock excavation. It is quite difficult to realize the full technical potential of an excavator and achieve designed engineering-and-economic performance in actual operational conditions due to the complexity of matching and coordinating working motions (lifting and thrusting) of its main actuating mechanisms while moving the bucket about the excavation face. 2. The goal of the research and its tasks The research is aimed at increasing the power efficiency of open-pit excavators (mechanical shovels) by properly matching operational parameters of their main mechanisms, which act in joint during the process of rock excavation.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
